Los Angeles Dodgers star Matt Kemp surprised the sexy singer on Saturday with a 22nd birthday party in Phoenix, E! News has learned.

Rihanna was "shocked" by the ballplayer's gesture, apparently expecting a small get-together with a few friends, a source says. She had no clue what was really in store for her.

So how did it go?

Pretty great. Kemp had been planning the event for at least a month to make sure Rihanna's birthday was special, according to an insider.

There were flowers, Sprinkles cupcakes, tiki torches in the pool, engraved bottles of Ace of Spades champagne and Johnny Walker Blue, as well as a Jamaican chef who whipped up lots of appetizers for the crowd.

Around 40 people showed up, including both Rihanna's friends and some of Kemp's baseball pals.

Kemp brought out a cake decorated with the songstress's various tattoos, while everyone sang "Happy Birthday."

Nothing says "I Love You" like a cake decorated with your tattoos. Kemp clearly does a lot of thinking about the inking! (Kemp also gave Rihanna a nice diamond necklace, which I'm sure helped Rihanna celebrate as well.)

The bad news? Well, the entertainment selection is a little...unusual.

"Yeah, I'm pretty certain you can stand under my umbrella."

Rihanna celebrated her birthday on Saturday night with boyfriend Matt Kemp, a few close friends ... and a little person who gives lap dances. [...]

UPDATE: The tiny dancer is "Bridget the Midget," a porn star who also appeared on "Cathouse."

It’s probably safe to say that Matt just moved up in the rankings from “Friend” to “Good Friend” status. We women love surprises of the good variety! A diamond necklace along with a party can go a very long way. But really, a stripping porno midget? Not my cup of tea, but Matty gets points for originality and creativity.